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prerequisite are skipped when running the setup for the first time

Hi

I'm using basic MSI project in ISH 2010
My setup include a .net 3.5 SP1 prerequisite which works great except for two machines
When I run the setup.exe for the first it skip the prerequisite part and directly display the Install Welcome dialog, than if I cancel the setup and run it again the prerequisite dialog is displayed with .net 3.5 SP1.

The problematic machines are regular Win XP 32bit with windows installer 4.5 installed and it's services looks OK.
Any idea what can cause this problem ?

Do you talk about a prerequisite or feature prerequisite?
You can generate seperate log files, one for Setup.exe and one for the MSI installation. Just launch Setup.exe with the /debuglog parameter. Setup.exe creates a InstallShield.log file in the same folder.